Re: tableam.h fails cpluspluscheck

Hi,

On 2019-05-30 14:01:00 -0400, Tom Lane wrote:
> Using Apple's clang as c++ compiler:
>
> In file included from /tmp/cpluspluscheck.KejiIw/test.cpp:3:
> ./src/include/access/tableam.h:144:16: error: typedef redefinition with different types ('void (*)(Relation, HeapTuple, Datum *, bool *, bool, void *)' (aka 'void (*)(RelationData *, HeapTupleData *, unsigned long *, bool *, bool, void *)') vs 'IndexBuildCallback')
> typedef void (*IndexBuildCallback) (Relation index,
> ^
> ./src/include/access/tableam.h:36:8: note: previous definition is here
> struct IndexBuildCallback;
> ^
>
> (there are some cascading errors, but this is the important one)
>
> Kinda looks like you can't get away with using "struct" on a forward
> declaration of something that is not actually a struct type.

Ugh. Odd that only C++ compilers complain. I just removed the typedef,
it's not needed anymore (it used to be neccessary before moving
IndexBuildCallback's definition to tableam.h - but was wrong then too,
just cpluspluscheck didn't notice).

Pushed the obvious fix.

Greetings,

Andres Freund